2027 Writing Accessible Alt Text for a Public Health Infographic

Imed Bouchrika, PhD

by Imed Bouchrika, PhD

Co-Founder and Chief Data Scientist

What is alt text for a public health infographic?

Alt text is a text alternative attached to an image so assistive technology can convey its meaning. For a public health infographic, it should communicate the image's purpose and essential message in context. A screen reader may announce the alternative where the image appears; someone with images turned off may also see it.

Suppose an infographic visually summarizes a hypothetical vaccination clinic schedule. If the dates and locations already appear as nearby accessible text, useful alt text might be: "Illustrated summary of neighborhood vaccination clinic dates and locations listed below." If the schedule appears only inside the image, that sentence is not enough: provide the full schedule as real text, not an increasingly crowded image description.

Creating that text is a practical communication skill, not a reason by itself to pursue a degree. Students considering a broader foundation in population health can separately explore choosing an online public health bachelor's program.

Table of contents

Why does accessible alt text matter in public health communication?

People may rely on a screen reader, magnification, text-only access, or a low-bandwidth connection to obtain health information. If an infographic's only explanation is visual, those readers may miss an eligibility rule, a comparison, or the action the message asks them to take. Accessible text also gives editors a way to check whether the visual presentation and written claim agree.

The stakes are unusually concrete in public health: a missing qualifier can change who believes guidance applies to them. For example, describing a chart as showing "risk doubled" is misleading if it shows a hypothetical increase from 1 case to 2 cases in a small population without explaining the denominator. Accessibility work therefore includes checking the underlying message, not merely adding an image attribute.

Health communication is one skill among many used in public health jobs. Readers exploring employment should treat career salary ranges for MPH degree holders as career context, not as evidence that writing alt text requires an MPH or leads to a particular salary.

How fast is U.S. employment for occupational health and safety specialists projected to grow?

How do you write effective alt text for public health infographics?

Start with the reader's task: understanding a finding, locating a service, or following a prevention recommendation. Then determine what the surrounding page already states. These steps help prevent both omissions and repetitive screen-reader output:

  1. Read the infographic's title, labels, notes, and source; verify the intended takeaway against the underlying data or approved message.
  2. Identify what would be lost if the image disappeared, including qualifications such as who is eligible or which period a finding covers.
  3. Write a concise alternative that states the image's function and takeaway; move extended data or instructions into nearby accessible text.
  4. Check that the alternative and the visible content say the same thing, then review both with someone responsible for the health message.

There is no universal word limit that replaces editorial judgment. A brief image may need only a phrase; a dense infographic usually needs a brief alt text plus a fuller text equivalent. For a student learning this skill, a supervised communications project or accessibility training may be more direct than comparing affordable accelerated public health pathways solely to produce one deliverable.

What common alt text mistakes should public health communicators avoid?

The most consequential mistake is treating the alt-text field as a box to fill rather than a way to preserve meaning. "Image of an infographic" tells the reader almost nothing. At the other extreme, pasting every label into one unstructured alternative makes a complex graphic difficult to follow; use accessible page text or a table for detail.

Other errors include copying an unverified headline, omitting a denominator or eligibility condition, interpreting correlation as causation, relying on color names alone, and leaving old alt text attached after a graphic changes. Assign an owner for reviewing the image, alternative, and full description together whenever the public health message is updated.

Editing and supervised practice are more proportionate responses to these mistakes than an advanced credential. Questions about public health doctorate value and affordability belong to broader career planning, not to deciding whether a description accurately conveys an infographic.

Other Things You Should Know About Public Health

Can I use the same alt text on a website and social media?

Sometimes, but check each post in context. If a platform shows only the image and a short caption, information supplied in a website's nearby text may be missing there. Verify what each platform exposes to users.

Who should approve the final description?

The person accountable for the health content should check medical or public health accuracy; an accessibility reviewer should check how the description works in the published format. Community review is valuable when wording or interpretation may affect a particular audience.

Can an AI tool draft infographic alt text?

It can produce a draft, but a person must verify every value, qualifier, symbol, and recommendation against the approved graphic and source. Do not enter restricted health information into a tool without authorization.

How often should alt text be updated?

Review it whenever the image, underlying data, service details, or public guidance changes. A previously accurate alternative can become misleading even if the image file keeps the same name.